Electrical current-indicator



(No'Model.)

P. LANGE.

ELECTRICAL CURRENT INDICATOR.

Patented May 3, 1887.

N. PETERS. Phuxwullmgmpher. wnhingtun. D.C,

UNITED STATES PATENT OEEICE.

PHILPP'LANGE, OF NEW' YORK, N. Y., ASSIGNOR TO GEORGE VESTING- HOUSE,JR., OF PITTSBURG, PENNSYLVANIA.

ELECTRlCAL CURRENT-INDICATOR.

SPECIFICATION forming part of Letters Patent No. 362,451, dated May 3,1887. Application filed August I7, 1.886. Serial No. 211,111. (Nomodel.)

To @ZZ whom, it may concern:

Be it known that I, PHILIPP LANGE, a subject of the Emperor of Germany,but having declared my intention of becoming a citizen of the UnitedStates, residing in New York, in the county and State of New York, haveinvented certain new and useful Improvements in Electrical Indicators,of which the following is a specication. e

My invention relates to the class of devices employed for indicating thestrength of the current employed in operating systems of electricaldistribution.

The object of the invention is to provide ac-` curate and vreliablemeans for measuring or indicating the electro-motive force of a currentupon an electric circuit; and it consists, in general terms, in thefollowing organization of apparatus:

A galvanomcter is constructed with two equal and opposing coils, andcurrents of the same strength do not ai'f'ect the needle, but au excessof current in either coil will occasion a corresponding deflection. Oneof the galvanometer-coils is connected in circuit with a carbonresistance-au incandescent lamp, for instance-while in the circuit ofthe other there is included a metallic resistance. These two resistancesare equal under the inucnce ot' currents of a certain clcctro-motiveforce. If the electro-motive force is kept constant, the galvanometerwilly notshow any deflection; but an increase of electro-motive forcewill send a stronger current through both circuits. This will reduce theresistance ofthe carbon circuit without decreasing the resistance 'ofthe metallic circuit. Thus more current will pass through the carbonside of the instrument and a corresponding deflection of the needle isoccasioned. A decrease in t-he electro-motive forcewill dcllect theneedle in the opposite dia diagram illustrating the application of theinvention to a galvanometer, and Fig 2 its application to a polarizedrelay.

Referringto the drawings, in Fig. I A represents a galvanometer havingtwo equal and opposing coils, e and a2. The needle a is acted upon bythese coils. The two coils are respectively connected in branchconductors Z and Z2 of a main conductor, L, which may be any suitableportion of any desired system of electric distribution. for instance, asanincandescent electric light, c-is included in the conductor Z,togetherwith the coil e. In like manner a metallic resistance, c2, is includedinthe conductor?, together with the coils c2. An adjustable artificialresistance, D, is also includedin this circuit,and this resistance is soadjusted that with a normal current upon the line L the two coils willhave equal effects upon the needle e. An increase, however, of theelectro-motive force will cause a greater amount of current to traverseboth circuits, and such increase will cause the carbon resistance tobecome heated, and thus its `.resistance will be reduced, whereupon anexcess of current will traverse the coil a,a.nd thus thegalvanometer-ncedlc c will be correspondingly deflected.

In Fig. 2 the galvanometer is replaced by a relay, A', having itsopposing coils a and al included in two lines, Z and Z2, respectively.The polarized armature a is provided with two contact-stops, a and et,respectively, constituting terminals of circuits derived from a batteryor generator, 0. the armature a by a conductor, 3, and the other pole isconnected by conductors Iand 2 through any suitable form of indicatingdevicessuch, for instance, as a red light, E, and a blue light, E2.

The polarization of the armature a may be conveniently secured byleading the conductor L through a coil, a5, surrounding the armature orits support.

I claim as my inventionl. An electrical indicator consisting of twoopposing coils, anarmature acted upon thereby, two branch circuitsincluding said coils, respectively, a carbon resistance in one circuit,and a metallic resistance in the other circuit.

2. An electric indicator consisting of two A carbon resistance-esuch,

One pole is connected withh IOO circuits, local circuits controlled bythe action of said relay, and indicating devices included in said localcircuits, substantially as described.

In testimony whereof I have hereunto subscribed my naine this 13th dayof August7 A. D. 1886.

PHILHL LANGE'. Titnessesz DANL. XV. EDGECOMB, CHARLES A. TERRY.

